KretzschmarIf it snows a decent amount (ie 1 foot+) and you want to ski uncrowded, minimally touched laps, go to Solitude. Ive been there after a 25 inch storm and the parking lot was half full and no lines anywhere. That being said, if you don't know it, you can still have fun you just might not find all the good spots but I'd still say you should check it out once if it snows.
Alta is Alta. Always fun and basically a gigantic natural terrain park. Get's pretty busy on weekends especially if it dumps.
I have no opinions on Snowbird since I've never been there.
You nailed it. Bird is the same deal. Great skiing, just gotta fight traffic and crowds. Its the go-to pow shredding hub for lots and weekends are a madhouse.
Early birds always get the worm but solly is the dankie nugs.